The extension height of a base jack directly affects the stability and load-bearing capacity of the scaffolding system. Excessive extension may cause a shift in the center of gravity, increasing the risk of overturning; insufficient extension will reduce the support effect. Properly adjusting the height of the base jack ensures the scaffolding system remains stable during construction and adapts to different ground conditions.
According to the usage specifications for scaffolding base jacks, the insertion length of the base jack into the upright should not be less than 150mm, and the safe extension height should not exceed 300mm. Excessive length will reduce the stability of the scaffolding system. All base jacks should have a consistent extension length to evenly distribute the load and avoid uneven stress.
Using base jacks allows for scaffolding adjustments on uneven ground. The safe length of a base jack depends on its type and purpose; different base jacks have different extension heights. Before use, it is necessary to check the specifications of each manufacturer to prevent exceeding the maximum height. EK Scaffolding's base jacks feature a snapped thread or spot weld at the maximum limit to prevent the nut from rotating beyond the jack's maximum height.
Why limit the safe length of base jacks?
Excessive extension of the base jack can affect the stability of the entire scaffolding, posing a risk of tipping. Setting a safe length for the base jacks, and using them within that safe range, ensures the scaffolding system is a safe and reliable working platform.
Reasonable Extension Height Range
The extension height of base jacks is typically controlled within the range of 10-15 cm. This height ensures both the stability and load-bearing capacity of the scaffolding system. Ground conditions also affect the extension height; for example, soft ground allows for a longer extension length, while hard ground requires a shorter extension length.
What factors affect the maximum height of base jacks?
1. Ground Conditions
Soft or uneven ground can cause the base jack to sink or become unstable. In such cases, a base plate can be used to distribute the load and ensure stability.
2. Load-bearing Capacity
The load-bearing capacity of the scaffolding system also affects the maximum height of the base jacks. If the base jacks extend too high, it will reduce the load-bearing capacity of the scaffolding system, easily causing it to tip over.
3. Scaffolding Design
Different scaffolding systems have different scaffolding jack performance configurations.
For example:
In medium-duty scaffolding systems, the maximum height of the base jacks is typically 18 inches.
In heavy-duty scaffolding systems, the maximum height of the base jacks is typically 24 inches.
In mobile scaffolding systems, the maximum height of the base jacks is typically 12 inches.
Following the base jack usage guidelines can ensure the safety and stability of the scaffolding system.
Precautions for Adjusting Base Jacks
Even Distribution: The height of all scaffolding base jacks should be consistent to avoid uneven stress.
Regular Inspection: During construction, base jacks need to be checked regularly for looseness or damage.
Safety First: Ensure the safety of the scaffolding during adjustments to avoid accidents.
